diff --git a/openslides/assignment/models.py b/openslides/assignment/models.py
index 4b86b75cf..6ee41a9ef 100644
--- a/openslides/assignment/models.py
+++ b/openslides/assignment/models.py
@@ -161,6 +161,7 @@ class Assignment(models.Model, SlideMixin):
         participants = []
         for candidate in candidates.all():
             participants.append(candidate.person)
+        participants.sort(key=lambda person: person.sort_name)
         return participants
         #return candidates.values_list('person', flat=True)
 
@@ -179,7 +180,6 @@ class Assignment(models.Model, SlideMixin):
         poll.set_options([{'candidate': person} for person in self.candidates])
         return poll
 
-
     def vote_results(self, only_published):
         """
         returns a table represented as a list with all candidates from all
diff --git a/openslides/assignment/views.py b/openslides/assignment/views.py
index fde043889..7d2275371 100644
--- a/openslides/assignment/views.py
+++ b/openslides/assignment/views.py
@@ -537,7 +537,7 @@ class AssignmentPollPDF(PDFView):
             stylesheet['Ballot_title']))
         cell.append(Paragraph(self.poll.assignment.polldescription,
             stylesheet['Ballot_subtitle']))
-        options = self.poll.get_options().order_by('candidate')
+        options = self.poll.get_options()
 
         ballot_string = _("%d. ballot") % self.poll.get_ballot()
         candidate_string = ungettext("%d candidate", "%d candidates",
diff --git a/openslides/participant/models.py b/openslides/participant/models.py
index 6f90709f4..9dffca2de 100644
--- a/openslides/participant/models.py
+++ b/openslides/participant/models.py
@@ -83,6 +83,12 @@ class User(DjangoUser, PersonMixin, Person, SlideMixin):
         self.set_password(password)
         self.save()
 
+    @property
+    def sort_name(self):
+        if config['participant_sort_users_by_first_name']:
+            return self.first_name
+        return self.last_name
+
     @models.permalink
     def get_absolute_url(self, link='view'):
         """
diff --git a/openslides/utils/person/api.py b/openslides/utils/person/api.py
index 5c842dea2..92fd7f23a 100644
--- a/openslides/utils/person/api.py
+++ b/openslides/utils/person/api.py
@@ -29,6 +29,14 @@ class Person(object):
         """
         return str(self.person_id)
 
+    @property
+    def sort_name(self):
+        """
+        Return the part of the name, which is used for sorting.
+        For example the pre-name or the last-name
+        """
+        return self.__repr__()
+
     @property
     def clean_name(self):
         """